Climate change increases carbon allocation to leaves in early leaf green-up |
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| Authors: | Fandong Meng Songbai Hong Jiawei Wang Anping Chen Yao Zhang Yichen Zhang Ivan A Janssens Jiafu Mao Ranga B Myneni Josep Peñuelas Shilong Piao |
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| Institution: | 1. State Key Laboratory of Tibetan Plateau Earth System and Resources Environment (TPESRE), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China;2. Sino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, Beijing, China;3. Department of Biology and Graduate Degree Program in Ecology, Colorado State University, Fort Collins, Colorado, USA;4. Department of Biology, University of Antwerp, Wilrijk, Belgium;5. Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA;6. Department of Earth and Environment, Boston University, Boston, Massachusetts, USA;7. CSIC, Global Ecology Unit CREAF-CSIC-UAB, Bellaterra, Barcelona, Catalonia, Spain |
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| Abstract: | Global greening, characterized by an increase in leaf area index (LAI), implies an increase in foliar carbon (C). Whether this increase in foliar C under climate change is due to higher photosynthesis or to higher allocation of C to leaves remains unknown. Here, we explored the trends in foliar C accumulation and allocation during leaf green-up from 2000 to 2017 using satellite-derived LAI and solar-induced chlorophyll fluorescence (SIF) across the Northern Hemisphere. The accumulation of foliar C accelerated in the early green-up period due to both increased photosynthesis and higher foliar C allocation driven by climate change. In the late stage of green-up, however, we detected decreasing trends in foliar C accumulation and foliar C allocation. Such stage-dependent trends in the accumulation and allocation of foliar C are not represented in current terrestrial biosphere models. Our results highlight that a better representation of C allocation should be incorporated into models. |
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| Keywords: | allocation ratio foliar carbon allocation northern ecosystem optimal partitioning theory terrestrial biosphere models |
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